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    <title>Document</title>
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<body>
    <button>发送ajax</button>
</body>

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<script>
    $("button").click(() => {
        $.ajax({
            type:"get",
            url:"http://127.0.0.1:4000/show",
            dataType:"json",
            success:(data)=>{
                console.log(data)
            }     
         })
    })
</script>